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The Narrow-Line Region of the Seyfert 2 Galaxy Mrk 78: An Infrared View
We report near-infrared spectroscopic data for the Seyfert 2 galaxy Mrk78, taken with the LIRIS near-infrared camera/spectrometer at theWilliam Herschel Telescope (WHT). The long-slit spectra clearly showextended emission. The resolution and depth of the near-infrared spectraallow the examination of its morphology and ionization regions, and adirect comparison with similarly deep visible spectra. The emission-lineratios obtained are used to derive the extinction toward the nucleus.The detection of strong features such as [Fe II], H2,hydrogen recombination lines, and the coronal [Si VI] λ1.962 lineis used to study the kinematics and excitation mechanisms occurring inMrk 78, revealing that despite the strong radio-jet interaction presentin this object, photoionization from the active nucleus dominates thenarrow-line region emission, while UV fluorescence is the source of theH2 emission. Lines with extended emission yield velocitydistributions with an amplitude of about 600 km s-1, theconsequence of an eastern lobe moving away from us plus a western lobewith the opposite contribution. We used the photoionization code CLOUDYto recreate a typical narrow-line region, to derive the ionizationparameter, and to compare our spectral data with diagnostic diagrams.
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